The effect of procedure room temperature and humidity on LASIK outcomes.


Journal Article

OBJECTIVE: To determine whether procedure room temperature or humidity during LASIK affect refractive outcomes in a large patient sample. DESIGN: Retrospective cohort study. PARTICIPANTS: A total of 202 394 eyes of 105 712 patients aged 18 to 75 years who underwent LASIK at an Optical Express, Inc., location in their United Kingdom and Ireland centers from January 1, 2008, to June 30, 2011, who met inclusion criteria. METHODS: Patient age, gender, flap creation technique, pre- and 1-month post-LASIK manifest refraction, and ambient temperature and humidity during LASIK were recorded. Effect size determination and univariate and multivariate analyses were performed to characterize the relationships between LASIK procedure room temperature and humidity and postoperative refractive outcome. MAIN OUTCOME MEASURES: One month post-LASIK manifest refraction. RESULTS: No clinically significant effect of procedure room temperature or humidity was found on LASIK refractive outcomes. When considering all eyes in our population, an increase of 1°C during LASIK was associated with a 0.003 diopter (D) more hyperopic refraction 1 month postoperatively, and an increase in 1% humidity was associated with a 0.0004 more myopic refraction. These effect sizes were the same or similar when considering only myopic eyes, only hyperopic eyes, and subgroups of eyes stratified by age and preoperative refractive error. CONCLUSIONS: Neither procedure room temperature nor humidity during LASIK were found to have a clinically significant relationship with postoperative manifest refraction in our population.

Full Text

Cited Authors

  • Seider, MI; McLeod, SD; Porco, TC; Schallhorn, SC

Published Date

  • November 2013

Published In

Volume / Issue

  • 120 / 11

Start / End Page

  • 2204 - 2208

PubMed ID

  • 23769199

Pubmed Central ID

  • 23769199

Electronic International Standard Serial Number (EISSN)

  • 1549-4713

Digital Object Identifier (DOI)

  • 10.1016/j.ophtha.2013.04.015


  • eng

Conference Location

  • United States